From e59987a334e8318f160c35f188e205f3574a8255 Mon Sep 17 00:00:00 2001
From: neko <52202080+akiyamaneko@users.noreply.github.com>
Date: Mon, 28 Sep 2020 14:02:05 +0800
Subject: [PATCH 1/2] =?UTF-8?q?=E6=96=B0=E5=A2=9EAPI?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../src/main/java/cn/hutool/core/util/NumberUtil.java | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/hutool-core/src/main/java/cn/hutool/core/util/NumberUtil.java b/hutool-core/src/main/java/cn/hutool/core/util/NumberUtil.java
index a674fd4df..66adeee33 100644
--- a/hutool-core/src/main/java/cn/hutool/core/util/NumberUtil.java
+++ b/hutool-core/src/main/java/cn/hutool/core/util/NumberUtil.java
@@ -2162,6 +2162,17 @@ public class NumberUtil {
 	public static BigDecimal pow(BigDecimal number, int n) {
 		return number.pow(n);
 	}
+	
+	
+        /**
+         * 判断一个整数是否是2的幂
+         *
+         * @param n 待验证的整数
+         * @return 如果n是2的幂返回true, 反之返回false
+         */
+        public static boolean isPowerOfTwo(long n) { 
+                return (n > 0) && ((n & (n - 1)) == 0);
+        }
 
 	/**
 	 * 解析转换数字字符串为int型数字，规则如下：

From 77cc55a2772d3b99bcfea86b6b0724aeda4c521b Mon Sep 17 00:00:00 2001
From: neko <52202080+akiyamaneko@users.noreply.github.com>
Date: Mon, 28 Sep 2020 14:08:22 +0800
Subject: [PATCH 2/2] =?UTF-8?q?=E6=96=B0=E5=A2=9Eapi=E8=A1=A5=E9=BD=90?=
 =?UTF-8?q?=E5=8D=95=E5=85=83=E6=B5=8B=E8=AF=95?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../test/java/cn/hutool/core/util/NumberUtilTest.java  | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/hutool-core/src/test/java/cn/hutool/core/util/NumberUtilTest.java b/hutool-core/src/test/java/cn/hutool/core/util/NumberUtilTest.java
index 13ed9740c..654097cc2 100644
--- a/hutool-core/src/test/java/cn/hutool/core/util/NumberUtilTest.java
+++ b/hutool-core/src/test/java/cn/hutool/core/util/NumberUtilTest.java
@@ -252,4 +252,14 @@ public class NumberUtilTest {
 		final BigDecimal mul = NumberUtil.mul(new BigDecimal("10"), null);
 		Assert.assertEquals(BigDecimal.ZERO, mul);
 	}
+	
+	
+	@Test
+	public void isPowerOfTwoTest() {
+		Assert.assertEquals(false, NumberUtil.isPowerOfTwo(-1));
+		Assert.assertEquals(true, NumberUtil.isPowerOfTwo(16));
+		Assert.assertEquals(true, NumberUtil.isPowerOfTwo(65536));
+		Assert.assertEquals(true, NumberUtil.isPowerOfTwo(1));
+		Assert.assertEquals(false, NumberUtil.isPowerOfTwo(17));
+	}
 }